Explain This is a powerful browser extension that simplifies complex text by providing plain-language explanations with just a right-click. Designed to operate entirely within the user’s browser using a local large language model (LLM) powered by WebGPU, this tool prioritizes privacy by ensuring that no data is sent to external servers and no API keys are required.

Key Features

• Local Processing: Runs entirely in-browser for enhanced privacy. No server interactions mean that everything stays on the device, making it suitable for sensitive information.
• Quick Explanations: After selecting text and clicking "Explain This," the explanation process is instant post initial setup.
• Efficiency: The extension utilizes a modern LLM (Llama 3.2 1B, quantized) which is downloaded and cached during the first use, ensuring rapid subsequent access to explanations.
• User-Friendly Interface: The tool uses a simple right-click context menu for easy access, ensuring a seamless experience.

How It Works

The process involves a three-part system using Chrome’s extension architecture to handle the text selection workflow efficiently:

1. Text Selection: Users select text and invoke the extension via a right-click context menu.
2. Background Management: The background script manages the communication, creating an offscreen document necessary for WebGPU access.
3. Model Execution: The offscreen document processes the model and streams back the results, which are then displayed in a floating popup near the selected text.

Technical Requirements

• Browser Compatibility: Requires Chrome or Edge with recent desktop versions (Chrome 113+ is recommended) supporting WebGPU. The extension is not functional in browsers that lack this feature.
• Installation Instructions: For developers interested in setting up the extension, cloning the repository from GitHub and building it locally is required as it is not yet available via the Chrome Web Store.

Customization Options

Developers can swap models easily by changing the relevant constant in the configuration file, allowing for flexibility based on performance preferences for various tasks.

Overall, Explain This presents an effective solution for users looking for immediate, comprehensible explanations without compromising on privacy or requiring cumbersome server setups.